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Some acute physiological effects of inhaling fine particulate matter on respiration have been previously described (1-11). In those studies, comparisons were made between some respiratory responses to dust particles and carbachol aerosol. The response-preventive effect of sympathomimetic aerosols was pointed out. However, an analysis of the effect of these agents on pulmonary mechanics was not possible because suitable methods were not available at that time. The present study is an attempt to characterize, using a limited number of subjects, the nature of the response of the lungs to inhalation of fine inert particles by using methods of measurement which have been recently developed, some in this laboratory. The effects upon the mechanical characteristics of the lungs, in man, of inhaling dust particles and carbachol aerosol, and the effects after sympathomimetic aerosols, have been investigated during the present study. Wedid not have an opportunity to use an electron microscope for study of particle size, and did not expose large numbers of subjects to inhalation of particulate matter. Because some of the methods are quite new, information regarding spontaneous variation, or response to a pharmacologically inactive aerosol, such as distilled water, has not yet been published. The current status of these control measurements will be mentioned in the section on results.

the journal of clinical investigation/the journal of clinical investigation

Acute Effects of Breathing Inert Dust Particles and of Carbachol Aerosol on the Mechanical Characteristics of the Lungs in Man. Changes in Response after Inhaling Sympathomimetic Aerosols1